And neither of those showed signs of unprofessionalism, which seems to be the case with Martial.
I always find it funny that people give stick to Mourinho about KDB, Salah and Lukaku. He didn't treat any of them badly and has a good relationship with them. He even bought Lukaku "back" for the highest fee paid in the EPL for a striker.
However talented they were at the time the fact remains that they weren't ready to play week-in, week-out for a club that was challenging for the title and Mourinho had good players ahead of them. It was best for them to take a step down to a less ambitious club to prove themselves and Mourinho never stood in their way. They also made a profit on them, Chelsea.
It's not about Mourinho treating any of these guys badly - it's about mis managing them to the point that they were unable to play to their best ability or more commonly best positions.
Lukaku was forced to play target man type football at Chelsea under Jose due to his physical assets & struggled to do so. Was considered a better option at RW. Was said to have poor mentality & was sold.
De Bryune was not allowed to play CAM because he apparently lacked the work rate to play in such a position & was made to again play as a wide midfielder instead - eventually being played in a position he was not good in. Sold & in comparison to players like Oscar - carried the definition of being a lazy player.
Salah no consistency in game ratio & was predominantly on the subs - being replaced without having the ability to build any form. Struggled with the need for consistent defensive input on the side he played in comparison to the the opposing side where Eden Hazard was more free.
It's not all about Jose treating them badly - it's about not giving them good management.
Martial came to United as a striker - covered for Memphis being poor as a LW. So that is one example of him adapting his game for the benefit of the team. Jose comes in & changes his strikers number to Number 11 - a wingers number which is a direct correspondence of what happened to his role here at United - Like de bryune & Lukaku; got permanently moved to a role he doesn't feel the best in. Just like De bryune he ' begs to get out' of here now. He adapts to LW but then is replaced by another LW - one who is favoured over him.
Why should he wait & play 3rd position striker & 2nd LW - he is better than that. He has absolutely no experience as a RW & I bet he just wants to play as a striker again - the same way de bryune & Lukaku wanted to play football the way they loved or like Salah - just an opportunity to play football without being dropped - a chance to build form.
Whilst alot of fans will call martial lazy & say his shirt number swap was just a number - he actually attempted to change his role as well as his shirt number was a direct representation of mismanagement by Jose mourinho. The same as he has done with other players with good ability.